ZFR: Add it to Windows defender exception list? Surely there must be a way.
Dicethrower: It's flagged for a reason. It does something fishy and it has a chunk of code that is found to be malicious. People really shouldn't trust this patch. I'm sure it does what it promises, but might very well have a hidden DDoS client in there too or who knows what.
Let me see... someone creates a mod which improves an older game that few people play, in order to TAKE OVER THEIR MACHINES!
Sorry, but it lacks the evil genius vibe. More likely is that either 1. the download has been tampered with at whatever site you downloaded it from, or 2. it's been flagged as a false positive. My guess is number 2., but worth checking with other virus scanners and/or asking at the site you downloaded from.